Figure something happening in outskirts of Surrey (7)
I believe the answer is:
seventy
'figure' is the definition.
'something happening in outskirts of surrey' is the wordplay.
'something happening' becomes 'event' (I've seen this before).
'in' indicates putting letters inside.
'outskirts of' suggests removing the centre.
'surrey' with its middle removed is 'sy'.
'event' inserted inside 'sy' is 'SEVENTY'.
(Other definitions for seventy that I've seen before include "Threescore and ten" , "A number" , "LXX" , "Three score years and ten" .)