Fitting in Dig A Pony essentially, before end of set (3)
I believe the answer is:
apt
'fitting' is the definition.
(thesaurus)
'dig a pony essentially before end of set' is the wordplay.
'dig a pony essentially' becomes 'ap' (I am not sure about this - if you are sure you should believe this answer much more).
'before' says to put letters next to each other.
'end of' says to take the final letters.
The final letter of 'set' is 't'.
'ap'+'t'='APT'
'in' is the link.
Can you help me to learn more?
(Other definitions for apt that I've seen before include "apartment in Queens, say" , "Suitable for Pat" , "Ready to learn" , "Befitting" , "Apposite, appropriate" .)