She'll be back in January (3)
I believe the answer is:
una
'she'll' is the definition.
I can't judge whether this definition defines the answer.
'back in january' is the wordplay.
'back' shows that the letters should be reversed in order.
'in' indicates a hidden word.
'anu' can be found hidden inside 'january'.
'anu' in reverse letter order is 'UNA'.
'be' is the link.
Can you help me to learn more?
(Other definitions for una that I've seen before include "- - Stubbs, comedy actress" , "Girl's name; indefinite article (f. Italian)" , "- Stubbs, Eng. actress" , "of satellite with no sides" , "Girl" .)