Crossword Genius

Perish alongside retreating army corps (6)

Ross

I believe the answer is:

wither

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

'alongside retreating army corps' is the wordplay.
'alongside' becomes 'with' (I've seen this before).
'retreating' is a reversal indicator.
'army corps' becomes 'RE' (Royal Engineers).
're' in reverse letter order is 'er'.
'with'+'er'='WITHER'

(Other definitions for wither that I've seen before include "Dry up and die" , "Writhe (anag.)" , "Waste" , "Shrink, shrivel up" , "Dry up, shrivel (6)" .)

I've seen this clue in The Times.
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