Opportunist who looks after the enemy? (10)

I believe the answer is:

timeserver

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'opportunist' is the definition.
(timeserver is a kind of opportunist)

'looks after the enemy?' is the wordplay.
'looks' becomes 'server' (I am not sure about this - if you are sure you should believe this answer much more).
'after' says to put letters next to each other.
'the enemy?' becomes 'time' (reference to the phrase 'time is the enemy').
'server' put after 'time' is 'TIMESERVER'.

'who' acts as a link.

Can you help me to learn more?

(Other definitions for timeserver that I've seen before include "Vicar of Bray, for example" , "One just waiting to retire" , "Cynical changer of their opinions" .)

I've seen this clue in The Telegraph.

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