Young elephant caught with a large female (4)
I believe the answer is:
'young elephant' is the definition.
(I've seen this in another clue)
'caught with a large female' is the wordplay.
'caught' becomes 'c' (cricket abbreviation).
'with' says to put letters next to each other.
'large' becomes 'L' (eg in clothes sizes).
'female' becomes 'f' (abbreviation).
(Other definitions for calf that I've seen before include "Young cow or bull" , "Newborn cow" , "Part of the leg - baby farm animal" , "beef" , "Muscular back of the shank" .)