Temporary post working with clothing company (7)
I believe the answer is:
stopgap
'temporary' is the definition.
(a stopgap measure is a temporary one)
'post working with clothing company' is the wordplay.
'working with' is an anagram indicator (working with the letters).
'clothing company' becomes 'gap' (I can't explain this - if you can you should give a lot more credence to this answer).
'post' with letters rearranged gives 'stop'.
'stop'+'gap'='STOPGAP'
Can you help me to learn more?
(Other definitions for stopgap that I've seen before include "Improvisation" , "Provisional" , "Interim" , "Temporary measure" , "A temporary or impromptu substitute" .)