Lamb in trouble - ewe finally brought back (4)
I believe the answer is:
elia
'lamb' is the definition.
(pseudonym of essayist Charles Lamb)
'trouble ewe finally brought back' is the wordplay.
'trouble' becomes 'ail' (synonyms).
'finally' indicates one should take the final letters.
'brought back' is a reversal indicator.
The final letter of 'ewe' is 'e'.
'ail'+'e'='aile'
'aile' backwards is 'ELIA'.
'in' is the link.
(Other definitions for elia that I've seen before include "1A [SHEEPISH] part of 26 [LAMB-DA]" , "Pseudonym adopted by Charles Lamb" , "Charles Lamb's pen name" , "Pseudonym of Charles Lamb, 1775-1834" , "Essays of - (Charles Lamb)" .)