Went round to put a chap on the roster (7)

I believe the answer is:

rotated

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

'chap on the roster' is the wordplay.
'chap' becomes 'ted' ().
'on' means one lot of letters go next to another.
'the roster' becomes 'rota' (rota is a kind of roster).
'ted' after 'rota' is 'ROTATED'.

'to put a' is the link.
This may not be right. Some or all of it may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for rotated that I've seen before include "Turner did?" , "took part in revolution" , "Had spin" , "Went round" , "Turned round" .)

I've seen this clue in the Evening Standard.

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