Exploited don keeps ahead (3-4)

I believe the answer is:

put-upon

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

'don keeps ahead' is the wordplay.
'don' becomes 'put on' (synonyms).
'keeps' is an insertion indicator (inserted letters are kept inside).
'ahead' becomes 'up' (similar in meaning).
'puton' going around 'up' is 'PUT-UPON'.

(Another definition for put-upon that I've seen is " Taken advantage of".)

I've seen this clue in The Times.

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