Bird in a tangle? (4)
I believe the answer is:
knot
I believe this is a double definition.
'bird' is the first definition.
(knot is a kind of bird)
'a tangle?' is the second definition.
(I know that tangle can be written as knot)
'in' acts as a link.
(Other definitions for knot that I've seen before include "Fastening such as reef or granny" , "Tight interlacing of cord, string etc" , "Unit of speed used by ships" , "Entwine" , "Tie cord - lump in timber" .)