Crossword Genius

Carry on with period (4)

Ross

I believe the answer is:

wage

'carry on' is the definition.
(as in waging war)

'with period' is the wordplay.
'with' becomes 'w' (abbreviation).
'period' becomes 'age' (age is a kind of period).
'w'+'age'='WAGE'

(Other definitions for wage that I've seen before include "Money earned" , "Engage in - pay" , "Money paid to worker" , "Pursue" , "Amount earned" .)

I've seen this clue in The Times.
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