Evenly tanned pair of legs outside without end (2,3,2)
I believe the answer is:
on and on
'without end' is the definition.
(I've seen this in another clue)
'evenly tanned pair of legs outside' is the wordplay.
'evenly tanned pair of' becomes 'and' (I am not sure about this - if you are sure you should believe this answer much more).
'legs' becomes 'on on' ('on' can mean the leg side in cricket).
'outside' is an insertion indicator (some letters go outside others).
'and' placed into 'onon' is 'ON AND ON'.
Can you help me to learn more?
(Other definitions for on and on that I've seen before include "Ever" , "At tedious length" , "Endlessly" , "continuously" , "Unceasingly" .)