Crossword Genius

A little tin with fly in it (7)

Ross

I believe the answer is:

smidgen

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'a little' is the definition.
(thesaurus)

'tin with fly in it' is the wordplay.
'tin' becomes 'sn' ('Sn' can be a synonym of 'tin').
'with fly' becomes 'midge' (I've seen this before. I am not sure about the 'with' bit.**).
'in it' indicates putting letters inside.
'sn' placed around 'midge' is 'SMIDGEN'.

Can you help me to learn more?

(Other definitions for smidgen that I've seen before include "Iota" , "A very small amount (7)." , "A tad" , "Scarcely detectable amount" , "Dab" .)

I've seen this clue in The Times.
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