Has he to live at central Greenwich? (3)
I believe the answer is:
ben
'has he' is the definition.
'Ben' can be an answer for 'he' (I've seen this in another clue). I'm not sure about the 'has' bit.
'live at central greenwich?' is the wordplay.
'live' becomes 'be' (synonyms).
'at' is a charade indicator (letters next to each other).
'central' indicates the central letters.
The centre of 'greenwich' is 'n'.
'be'+'n'='BEN'
'to' is the link.
Can you help me to learn more?
(Other definitions for ben that I've seen before include "A Scottish mountain like Nevis" , "He's big in London" , "inner room in Oban, say" , "Mountain peak (Scot.)" , "A Gaelic mountain like Bulben" .)