Crossword Genius

Row about uniform with black beret originally and less trim (7)

Ross

I believe the answer is:

tubbier

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'beret originally and less trim' is the definition.
I can't tell whether this definition defines the answer.

'row about uniform with black' is the wordplay.
'row' becomes 'tier' (a tier is a row of things).
'about' is an insertion indicator.
'uniform' becomes 'U' (phonetic alphabet: alpha, bravo, charlie etc.).
'with' says to put letters next to each other.
'black' becomes 'bb'.
'u'+'bb'='ubb'
'tier' going around 'ubb' is 'TUBBIER'.

Can you help me to learn more?

(Other definitions for tubbier that I've seen before include "Squatter" , "round a bit more" , "Comparatively flabby" .)

I've seen this clue in The Sunday Times.
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