Being feverish, wraps second blanket to stretch (6)
I believe the answer is:
sprawl
'stretch' is the definition.
(I've seen this before)
'being feverish wraps second blanket' is the wordplay.
I cannot really see how this works, but
an anagram of 'wraps' is 'spraw' which is located in the answer.
'second blanket' could be 'l' (2nd letter of 'blanket') and 'l' is present in the answer.
This accounts for all the letters.
This may be the basis of clue (or it may be nonsense).
'to' acts as a link.
Can you help me to learn more?
(Other definitions for sprawl that I've seen before include "Urban or industrial expansion" , "Lie in an ungainly fashion" , "Lie untidily" , "Sit lazily, with limbs spread wide" , "Lounge" .)