Lean jockeys in lead, with food intake making body shapely (5,7)
I believe the answer is:
panel beating
'making body shapely' is the definition.
(beating the body of a car into shape)
'lean jockeys in lead with food intake' is the wordplay.
'jockeys' is an anagram indicator.
'in' is an insertion indicator.
'lead' becomes 'Pb' (Pb is the chemical symbol for lead).
'with' means one lot of letters go next to another.
'food intake' becomes 'eating' (taking in food).
'lean' is an anagram of 'anel'.
'anel' going into 'pb' is 'panelb'.
'panelb'+'eating'='PANEL BEATING'
(Other definitions for panel beating that I've seen before include "Restoring dented car bodywork" , "Metal work's needed" .)