Having good times round City, planned meeting to impregnate (9)

'impregnate' is the definition.
(thesaurus)

'having good times round' is the wordplay.
'having good' becomes 'fecund' (I can't justify this - if you can you should believe this answer much more).
'times' becomes 'dates' (date is a kind of time).
'round' indicates the central letters.
The central letters of 'dates' are 'ate'.
'fecund'+'ate'='FECUNDATE'

'city planned meeting to' is the link.
This may not be correct. Some or all of it may belong to another bit of the clue.