Art student undressed on vacation, ready to breed (2,4)
I believe the answer is:
at stud
'art student undressed' is the definition.
I know nothing about this answer so I cannot judge whether this works.
'on vacation ready to breed' is the wordplay.
'on vacation' says to hollow out the word (remove centre letters).
'ready' becomes 'apt' (I've seen this before).
'to breed' becomes 'stud' (I can't justify this - if you can you should believe this answer much more).
'apt' with its middle taken out is 'at'.
'at'+'stud'='AT STUD'
Can you help me to learn more?
(Another definition for at stud that I've seen is " Being used for breeding purposes".)