Crossword Genius

An attack force, one making U-turn (5-4)

Ross

I believe the answer is:

about-face

'u-turn' is the definition.
(I've seen this before)

'an attack force one' is the wordplay.
'an' becomes 'a'.
'attack' becomes 'bout' (eg a bout of flu).
'force' becomes 'f' (symbol used in Physics e.g. f=ma).
'one' becomes 'ace' (ace has a value of one in some card games).
'a'+'bout'+'f'+'ace'='ABOUT-FACE'

'making' acts as a link.

(Another definition for about-face that I've seen is " Complete change of opinion or attitude".)

I've seen this clue in The Independent.
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