Two monkeys and bear show off (10)
I believe the answer is:
grandstand
'show off' is the definition.
(I've seen this before)
'two monkeys and bear' is the wordplay.
'two monkeys' becomes 'grand' (I can't justify this - if you can you should give a lot more credence to this answer).
'and' is a charade indicator (letters next to each other).
'bear' becomes 'stand' (synonyms).
'grand'+'stand'='GRANDSTAND'
Can you help me to learn more?
(Other definitions for grandstand that I've seen before include "Main structure for watching sporting events" , "Terraced block of seats commanding the best view of a sporting event" , "Such a good view" , "From which spectators watch" , "Show off in America" .)