Postpone three holidays on the white cliffs (4,4)
I believe the answer is:
hold over
'postpone' is the definition.
(synonyms)
'three holidays on the white cliffs' is the wordplay.
I cannot really understand how this works, but
'on' could be 'over' (I've seen this in other clues) and 'over' is found within the answer.
The remaining letters 'hold' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for hold over that I've seen before include "Defer action on" , "... postpone" , "influence on another" .)