Urges foolishly to nose around for a horse (4,2)
I believe the answer is:
eggs on
'urges foolishly' is the definition.
'eggs on' can be an answer for 'urges' (I've seen this before). I'm unsure of the 'foolishly' bit.
'nose around for a horse' is the wordplay.
'nose' becomes 'conk' (informal term for nose).
'around' indicates the central letters.
'for' is a charade indicator (letters next to each other) (I've seen this in other clues).
'a horse' becomes 'eggs' (I can't justify this - if you can you should give a lot more credence to this answer).
The centre of 'conk' is 'on'.
'on' put after 'eggs' is 'EGGS ON'.
'to' acts as a link.
Can you help me to learn more?
(Other definitions for eggs on that I've seen before include "Incites" , "Urges" .)