Bear: little one ending in cave (4)
I believe the answer is:
tote
'bear' is the definition.
(I've seen this before)
'little one ending in cave' is the wordplay.
'little one' becomes 'tot' (I've seen this in another clue).
'ending in' says to take the final letters.
The final letter of 'cave' is 'e'.
'tot'+'e'='TOTE'
(Other definitions for tote that I've seen before include "Carry or shoulder" , "Capacious bag or basket" , "system for betters" , "Transfer" , "convey" .)