Tree full of bats, potentially? (6)
I believe the answer is:
willow
'tree' is the definition.
(willow tree is a kind of tree)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for willow that I've seen before include "One [TYPE OF TREE]" , "Common riverside tree" , "Osier; cricket bat" , "Pussy- - -" , "Fast-growing tree" .)