Tree seen in Skelmersdale (3)
I believe the answer is:
elm
'tree' is the definition.
(elm is a kind of tree)
'in skelmersdale' is the wordplay.
'in' says the answer is hidden in the clue.
'ELM' is hidden within 'skelmersdale'.
'seen' is the link.
(Other definitions for elm that I've seen before include "Gray's rugged tree (Elegy)" , "Tough timber" , "Deciduous tree with rough serrated leaves" , "Tree of the genus Ulmus" , "Tree for a Cockney tiller" .)