Huge place in London, did you say? (8)
I believe the answer is:
whopping
'huge' is the definition.
(whopping can informally mean huge)
'place in london did you say?' is the wordplay.
I cannot really understand how this works, but
'place' could be 'pin' and 'pin' is located in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for whopping that I've seen before include "Huge" , "Enormous" , "Very large" , "Gigantic" .)