Where a pig may come to a nasty end? (3)
I believe the answer is:
sty
'where a' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
'pig may come to a nasty end?' is the wordplay.
'pig may' becomes 'st' (I can't justify this - if you can you should give a lot more credence to this answer).
'come to' means one lot of letters go next to another.
'end?' says to take the final letters (I've seen 'end of' mean this).
The last letter of 'nasty' is 'y'.
'st'+'y'='STY'
Can you help me to learn more?
(Other definitions for sty that I've seen before include "Pig-pen and eye infection" , "Pig-pen and infection on the eyelid" , "Pig-house" , "Pig's enclosure" , "Filthy place" .)