Crossword Genius

Scallywag taking photograph of one applying lash? (14)

Ross

I believe the answer is:

whippersnapper

I'm a little stuck... Click here to teach me more about this clue!

'scallywag' is the definition.
(I've seen this before)

'photograph of one applying lash?' is the wordplay.
I cannot really understand how this works, but
'photograph' could be 'snap' (synonyms) and 'snap' is located in the answer.
'one' could be 'i' (Roman numeral) and 'i' is found in the answer.
This explanation may well be incorrect...

'taking' is the link.

Can you help me to learn more?

(Other definitions for whippersnapper that I've seen before include "cheeky upstart" , "Impudent lad" , "Presumptuous young person" , "Scallywag" , "Jumped-up youngster" .)

I've seen this clue in The Times.
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