Massage required by bishop having work-out? What rot! (7)
I believe the answer is:
rubbish
'rot' is the definition.
(thesaurus)
'massage required by bishop having work-out?' is the wordplay.
'massage' becomes 'rub' (rub can mean to massage).
'required by' means one lot of letters go next to another.
'bishop' becomes 'B' (abbreviation for bishop in chess).
'having work out?' becomes 'ish' (I can't justify this - if you can you should give a lot more credence to this answer).
'rub'+'b'+'ish'='RUBBISH'
'what' acts as a link.
Can you help me to learn more?
(Other definitions for rubbish that I've seen before include "Balderdash" , "Waste material - nonsense" , "Refuse, litter" , "of exceedingly low quality" , "Waste matter" .)