It's risky showing emotion during party with us (9)
I believe the answer is:
dangerous
'it's risky' is the definition.
('dangerous' can be similar in meaning to 'risky')
'emotion during party with us' is the wordplay.
'emotion' becomes 'anger' (anger is a kind of emotion**).
'during' means one lot of letters goes inside another.
'party' becomes 'do' (do is a kind of party).
'with' says to put letters next to each other.
'anger' placed inside 'do' is 'dangero'.
'dangero'+'us'='DANGEROUS'
'showing' is the link.
(Other definitions for dangerous that I've seen before include "Perilous, unsafe" , "Unsafe, risky" , "menacing" , "Not safe" , "posing a threat" .)