Holder seen playing in short leather trousers (10)
I believe the answer is:
lederhosen
'short leather trousers' is the definition.
'lederhosen' can be an answer for 'trousers' (I've seen this before). I'm not certain of the 'short leather' bit.
'holder seen playing' is the wordplay.
'playing' indicates an anagram.
'holder'+'seen'='holderseen'
'holderseen' anagrammed gives 'LEDERHOSEN'.
'in' acts as a link.
Can you help me to learn more?
(Other definitions for lederhosen that I've seen before include "Alpine shorts" , "Clothing" , "pants" , "Bavarian leather shorts" , "trousers displayed" .)