Bird made a cosy home but became tensed (6)
I believe the answer is:
nested
'bird made a cosy home' is the definition.
I can't tell whether this definition defines the answer.
'became tensed' is the wordplay.
'became' indicates anagramming the letters (I've seen 'become' mean this).
'tensed' with letters rearranged gives 'NESTED'.
'but' acts as a link.
Can you help me to learn more?
(Other definitions for nested that I've seen before include "Of bird, settled in to home" , "Settle in comfortably like a bird" , "Inhabited an egg-laying place" , "Built accommodation in a tree" , "(Of bird) made home - hunted for birds' eggs" .)