Crossword Genius

Straining, prepared to cover student allowance (10)

Ross

I believe the answer is:

filtration

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'straining' is the definition.
(thesaurus)

'prepared to cover student allowance' is the wordplay.
'prepared' becomes 'fit' (I can't explain this - if you can you should give a lot more credence to this answer).
'to cover' indicates putting letters inside.
'student' becomes 'l' (as in L-plates for learner drivers).
'allowance' becomes 'ration' (I've seen this before).
'fit' going around 'l' is 'filt'.
'filt'+'ration'='FILTRATION'

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I've seen this clue in The Telegraph.
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