For a star, performing has its difficulties (7)
I believe the answer is:
straits
'difficulties' is the definition.
(I've seen this before)
'for a star performing has its' is the wordplay.
'for a' becomes 's' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'performing' is an anagram indicator (the letters move around or 'perform').
'has' indicates putting letters inside.
'its' becomes 'it' (I've seen this in other clues).
'star' with letters rearranged gives 'tras'.
'tras' enclosing 'it' is 'traits'.
's'+'traits'='STRAITS'
Can you help me to learn more?
(Other definitions for straits that I've seen before include "... of Magellan, Hormuz" , "Difficulties" , "Sea passages" , "Narrow channels of the sea joining two larger bodies of water" , "Dire --, rock band" .)