Crossword Genius

Uncertain when foxtrot changing (9)

Ross

I believe the answer is:

faltering

'uncertain' is the definition.
(I've seen this before)

'foxtrot changing' is the wordplay.
'foxtrot' becomes 'f' (phonetic alphabet: alpha, bravo, charlie etc.).
'changing' becomes 'altering' (altering is a kind of changing).
'f'+'altering'='FALTERING'

'when' acts as a link.

(Another definition for faltering that I've seen is " Uncertain".)

I've seen this clue in The Telegraph.
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