A sum everybody gets in the outskirts of Torquay (5)
I believe the answer is:
tally
'a sum' is the definition.
(I know that sum can be written as tally)
'everybody gets in the outskirts of torquay' is the wordplay.
'everybody' becomes 'all' (all people).
'gets in' means one lot of letters goes inside another.
'the outskirts of' says to hollow out the word (remove centre letters) (only letters on the outskirts).
'torquay' with its centre taken out is 'ty'.
'all' placed inside 'ty' is 'TALLY'.
(Other definitions for tally that I've seen before include "Mark" , "Record; current score" , "Running total" , "Reckoning of a debt or of votes" , "Count, add up" .)