Crossword Genius

Dressing up military volunteers -- flipping exhausting (8)

Ross

I believe the answer is:

attiring

'dressing up' is the definition.
('attire' can be a synonym of 'dress up')

'military volunteers flipping exhausting' is the wordplay.
'military volunteers' becomes 'TA' (Territorial Army, volunteer reserve of UK army).
'flipping' shows that the letters should be reversed in order.
'exhausting' becomes 'tiring' (synonyms).
'ta' reversed gives 'at'.
'at'+'tiring'='ATTIRING'

(Another definition for attiring that I've seen is " Dressing (oneself)".)

I've seen this clue in The Telegraph.
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