More pilots flying in London, for instance (10)
I believe the answer is:
metropolis
'london for instance' is the definition.
(I know that London is a metropolis)
'more pilots flying' is the wordplay.
'flying' is an anagram indicator (letters fly around into new positions).
'more'+'pilots'='morepilots'
'morepilots' with letters rearranged gives 'METROPOLIS'.
'in' is the link.
(Other definitions for metropolis that I've seen before include "Very large city" , "Urban centre" , "capital" , "Big city" , "Expressionist movie" .)