Capacity of certain chaps in the new team (11)
I believe the answer is:
measurement
'capacity' is the definition.
(thesaurus)
'certain chaps in the new team' is the wordplay.
'certain' becomes 'sure' (synonyms).
'chaps' becomes 'men' (chap can mean a man).
'in' means one lot of letters goes inside another.
'the new' is an anagram indicator.
'sure'+'men'='suremen'
'team' with letters rearranged gives 'meat'.
'suremen' inserted inside 'meat' is 'MEASUREMENT'.
'of' is the link.
(Other definitions for measurement that I've seen before include "Dimension" , "Size" , "What a ruler may give" , "Mensuration" .)