On income support being entertained by mature, adult books - leading to bother (10)
I believe the answer is:
antagonise
'bother' is the definition.
(antagonising is a kind of bothering)
'on income support being entertained by mature adult books leading' is the wordplay.
'income support' becomes 'IS' (abbreviation for income support).
'being entertained' means one lot of letters goes inside another.
'by' says to put letters next to each other.
'mature' becomes 'age' (synonyms).
'adult books leading' becomes 'ant' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'on'+'is'='onis'
'age' put after 'ant' is 'antage'.
'onis' going within 'antage' is 'ANTAGONISE'.
'to' acts as a link.
Can you help me to learn more?
(Other definitions for antagonise that I've seen before include "Provoke hostility" , "Arouse hostility" , "Make an enemy of" , "Create hostility" , "Get on the wrong side of" .)