Crossword Genius

Soldier on a plain (9)

Ross

I believe the answer is:

persevere

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

'a plain' is the wordplay.
'a' becomes 'per'.
'plain' becomes 'severe' ('severe' can be similar in meaning to 'plain').
'per'+'severe'='PERSEVERE'

(Other definitions for persevere that I've seen before include "Fight on" , "Persist, stick at" , "give it another try" , "Serve peer (anag.)" , "Continue regardless" .)

I've seen this clue in The Telegraph.
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