A pole that's round with poles on decks (6)
I believe the answer is:
adorns
'decks' is the definition.
(I've seen this before)
'a pole that's round with poles' is the wordplay.
'pole' becomes 'rod' ('rod' can be a synonym of 'pole'**).
'that's round' says the letters should be written backwards.
'with' says to put letters next to each other.
'poles' becomes 'ns' (North and South poles).
'rod' backwards is 'dor'.
'a'+'dor'+'ns'='ADORNS'
'on' is the link.
(Other definitions for adorns that I've seen before include "'Decorates, embellishes (6)'" , "Decorates with ornaments" , "Adds ornamentation" , "Bedecks" , "decks" .)