Not all occupy London's tower (5)

I believe the answer is:

pylon

'tower' is the definition.
(pylon is a kind of tower)

'not all occupy london's' is the wordplay.
'not all' indicates the answer is hidden within the clue.
'PYLON' can be found hidden inside 'occupy londons'.

(Other definitions for pylon that I've seen before include "Steel tower supporting high-tension wires" , "Steel structure carrying cables" , "Electricity grid construction" , "Steel tower carrying power lines" , "power supplier?" .)

I've seen this clue in The Times.

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