Edge past farm animal, to pick this? (5)
I believe the answer is:
oxlip
'pick this?' is the definition.
(flower which may be picked)
'edge past farm animal' is the wordplay.
'edge' becomes 'lip' (lip is a kind of edge).
'past' says to put letters next to each other.
'farm animal' becomes 'ox'.
'lip' after 'ox' is 'OXLIP'.
'to' is the link.
(Other definitions for oxlip that I've seen before include "Eurasian primrose with yellow flowers" , "Kind of yellow primrose" , "Type of primula" , "Woodland plant" , "Flower of the primrose family" .)