Trees that may be sacred (6)
I believe the answer is:
cedars
'trees' is the definition.
(cedar is a kind of tree)
'may be sacred' is the wordplay.
'may be' is an anagram indicator.
'sacred' anagrammed gives 'CEDARS'.
'that' is the link.
(Other definitions for cedars that I've seen before include "(Lebanese?) trees" , "Strangely sacred trees" , "Sacred (anag) -- trees" , "Trees with perfumed wood" , "Fragrant trees of the Lebanon" .)