Symbol of bear on bottom of form (5)
I believe the answer is:
totem
'symbol' is the definition.
(thesaurus)
'bear on bottom of form' is the wordplay.
'bear' becomes 'tote' (I've seen this before).
'on bottom of' indicates one should take the final letters.
The last letter of 'form' is 'm'.
'tote'+'m'='TOTEM'
'of' is the link.
(Other definitions for totem that I've seen before include "Natural thing adopted as an emblem" , "Animal as clan symbol" , "Natural object carved on poles by North American Indians" , "family emblem" , "Image representing tribe" .)