Part of Greater London? Ha - indeed! (5)

I believe the answer is:

hayes

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'part of greater london?' is the definition.
'hayes' can be an answer for 'part' (I have seen 'Part of Hillingdon ' mean 'hayes' so perhaps 'part' could also mean 'hayes'). I'm not certain of the 'of greater london?' bit.

'ha indeed' is the wordplay.
'indeed' becomes 'yes' (agreeing).
'ha'+'yes'='HAYES'

Can you help me to learn more?

(Other definitions for hayes that I've seen before include "Part of Hillingdon" , "Location in Middlesex" , "part of London" , "Former US President" , "West London town; ah, yes (anag.)" .)

I've seen this clue in the Evening Standard.

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