Crossword Genius

Unit of flow (not force) (3)

Ross

I believe the answer is:

lux

'unit' is the definition.
(lux is a kind of unit)

'flow not force' is the wordplay.
'flow' becomes 'flux' (flux is a kind of flow).
'not' suggests deleting specific letters.
'force' becomes 'f' (symbol used in Physics e.g. f=ma).
'flux' with 'f' taken out is 'LUX'.

'of' is the link.

(Another definition for lux that I've seen is " a little bright intensity".)

I've seen this clue in the Independent.
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