Bear east of port, coming across a storm (10)
I believe the answer is:
hullabaloo
'storm' is the definition.
(I know that storm can be written as hullabaloo)
'bear east of port coming across a' is the wordplay.
'bear' becomes 'baloo' (bear in The Jungle Book).
'east of' means one lot of letters go next to another (some letters go to the right of others).
'port' becomes 'hull' (I've seen this before).
'coming across' says to put letters next to each other.
'hull'+'a'='hulla'
'baloo' after 'hulla' is 'HULLABALOO'.
(Other definitions for hullabaloo that I've seen before include "Brouhaha" , "Agitation or excitement" , "Row" , "racket" , "stir" .)