Loathing endless calamity installing team's leader (8)
I believe the answer is:
distaste
'loathing' is the definition.
(I've seen this before)
'endless calamity installing team's leader' is the wordplay.
'endless' means to remove the last letter.
'calamity' becomes 'disaster' (calamity can mean a disaster).
'installing' means one lot of letters goes inside another (I've seen this in other clues).
'leader' indicates taking the first letters.
The first letter of 'teams' is 't'.
'disaster' with its last letter taken away is 'disaste'.
'disaste' enclosing 't' is 'DISTASTE'.
(Other definitions for distaste that I've seen before include "Negative feeling" , "Mild dislike, aversion" , "lack of relish?" , "Loathing" , "Adverse reaction" .)