More context would help :D

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it is an accounting translation

this is what is used in the US.
Retainer- A retainer fee is an advance payment on the hourly rate for services to be performed by an attorney, and is intended to insure that the attorney ...
www.dblegal.com/findlawyer/findatt4.asp - 12k - Cached - Similar pages

How, and How Much, Do Lawyers Charge?A retainer fee is typically, but not always, an advance payment on the hourly rate for a specific case. The lawyer puts the retainer in a special trust ...
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Different types of attorney billing methodsA retainer fee is the fee which detains an attorney for legal counsel. With this fee, the attorney is certain of the seriousness of your intentions and can ...
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Sample Attorney RetainerThis amount is a true retainer fee and its payment by CLIENT to ATTORNEY guarantees that the ATTORNEY will set time aside for this case. ...
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Note added at 18 hrs (2007-02-12 05:16:51 GMT)
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the defendant so and so shall pay a reatiner fee to cover....

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Note added at 18 hrs (2007-02-12 05:17:20 GMT)
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sorry it is retainer not "reatiner"

It is a loan because the sentence states that it is a taslif.