Crossword Genius

An offhand impression (11)


I believe the answer is:


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'an offhand impression' is the definition.
'fingerprint' can be an answer for 'impression' (thesaurus). I am not sure about the 'an offhand' bit.

'offhand impression' is the wordplay.
'offhand' becomes 'finger' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'impression' becomes 'print' (impression created by a printer).

Can you help me to learn more?

(Other definitions for fingerprint that I've seen before include "Mark left by handler" , "Dab" , "means of identification" .)

I've seen this clue in The Globe and Mail.
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