Crossword Genius

Very small American male in charge (6)

Ross

I believe the answer is:

atomic

'very small' is the definition.
(I've seen this in another clue)

'american male in charge' is the wordplay.
'american' becomes 'a' (common abbreviation - e.g. in organisation names).
'male' becomes 'tom' (I've seen this in other clues).
'in charge' becomes 'ic' (abbreviation for 'in charge').
'a'+'tom'+'ic'='ATOMIC'

(Other definitions for atomic that I've seen before include "Extremely small" , "Based on nuclear energy" , "Very little" , "Relating to basic particles" , "Relating to tiny particles" .)

I've seen this clue in The Sun.
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