Mother's absurd tailored garment (7,6)
I believe the answer is:
bermuda shorts
'garment' is the definition.
(Bermuda shorts is an example)
'mother's absurd tailored' is the wordplay.
'tailored' indicates an anagram (the letters are customised ).
'mothers'+'absurd'='mothersabsurd'
'mothersabsurd' anagrammed gives 'BERMUDA SHORTS'.
(Other definitions for bermuda shorts that I've seen before include "Formal trousers reaching almost to the knee" , "Trousers that end at the knees" , "beachwear" , "Knee-length garment" , "Casual garment" .)