Crossword Genius

Loud user of tongue in a flash (7)

Ross

I believe the answer is:

flicker

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'a flash' is the definition.
(flicker is a kind of flash)

'loud user of tongue in' is the wordplay.
'loud' becomes 'f' (short for forte - 'loud' in music).
'user of' becomes 'er' (I can't justify this - if you can you should believe this answer much more).
'tongue' becomes 'lick'.
'in' indicates putting letters inside.
'f'+'er'='fer'
'fer' enclosing 'lick' is 'FLICKER'.

Can you help me to learn more?

(Other definitions for flicker that I've seen before include "Shine unsteadily; waver" , "Twinkle" , "Spark" , "Woodpecker" , "Burn or shine unsteadily" .)

I've seen this clue in The Guardian.
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