Mogul has important Turner (3,5)
I believe the answer is:
big wheel
'mogul' is the definition.
(thesaurus)
'important turner' is the wordplay.
'important' becomes 'big' (synonyms).
'turner' becomes 'wheel' (I can't explain this - if you can you should believe this answer much more).
'big'+'wheel'='BIG WHEEL'
'has' is the link.
Can you help me to learn more?
(Other definitions for big wheel that I've seen before include "Fairground attraction - VIP" , "Fairground ride" , "Amusement as London Eye" , "Fair experience" , "going round in London" .)