Mammoth embrace with ogre at last (4)
I believe the answer is:
huge
'mammoth' is the definition.
(synonyms)
'embrace with ogre at last' is the wordplay.
'embrace' becomes 'hug' (hug is a kind of embrace).
'with' says to put letters next to each other.
'at last' indicates one should take the final letters.
The last letter of 'ogre' is 'e'.
'hug'+'e'='HUGE'
(Other definitions for huge that I've seen before include "Unusually large" , "Jumbo" , "Vast; immense" , "Great in size or amount" , "Gigantic" .)