Opportunists, one waiting to open morning paper (4-7)

I believe the answer is:

time-servers

'opportunists' is the definition.
(person who changes their views with the times)

'one waiting to open morning paper' is the wordplay.
'one waiting' becomes 'server' (eg a server or waiter at a restaurant).
'to open' indicates putting letters inside (some letters create an opening in a word).
'morning paper' becomes 'Times' (UK newspaper).
'server' placed into 'times' is 'TIME-SERVERS'.

I've seen this clue in The Guardian.

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