On length for example (3)
I believe the answer is:
leg
'on' is the definition.
(cricket term, fielding positions)
'length for example' is the wordplay.
'length' becomes 'l'.
'for' means one lot of letters go next to another.
'example' becomes 'eg' (**).
'l'+'eg'='LEG'
(Other definitions for leg that I've seen before include "Lower limb" , "Gigot" , "Section of journey; limb" , "Run < on" , "prop" .)