Pull first of many gents and aim to arouse (9)
I believe the answer is:
magnetism
'pull' is the definition.
(thesaurus)
'first of many gents and aim to arouse' is the wordplay.
'first of many' becomes 'm' (1st letter of 'many').
'and' means one lot of letters go next to another.
'to arouse' indicates an anagram (I've seen 'aroused' mean this (letters roused or stirred up into a new form)).
'gents' put after 'aim' is 'aimgents'.
'aimgents' is an anagram of 'agnetism'.
'm'+'agnetism'='MAGNETISM'
(Other definitions for magnetism that I've seen before include "Drawing power" , "Attraction" , "Charisma" , "Attractive force" .)