Figure there’s a month before the start of November (7)
I believe the answer is:
decagon
'figure' is the definition.
(I've seen this before)
'a month before the start of november' is the wordplay.
'a month' becomes 'dec' (Dec is an example**).
'before' becomes 'ago' (I've seen this before).
'the start of' indicates taking the first letters.
The first letter of 'november' is 'n'.
'dec'+'ago'+'n'='DECAGON'
'there's' acts as a link.
(Other definitions for decagon that I've seen before include "Ten-sided plane figure" , "10-sided figure" , "Go, dance on geometric figure with ten sides" , "A polygon -- eg can-do (anag)" , "Ten-sided shape" .)