Turn to hold mug and a tumbler (7)
I believe the answer is:
acrobat
'tumbler' is the definition.
(synonyms)
'turn to hold mug and a' is the wordplay.
'turn' becomes 'bat' (bat is a kind of turn).
'to' means one lot of letters go next to another (I've seen this in other clues).
'hold mug' becomes 'cro' (I can't explain this - if you can you should give a lot more credence to this answer).
'and' is a charade indicator (letters next to each other).
'cro' put after 'a' is 'acro'.
'bat' put after 'acro' is 'ACROBAT'.
Can you help me to learn more?
(Other definitions for acrobat that I've seen before include "Tightrope-walker" , "Rope-dancer" , "Performer going head over heels?" , "flipper" , "Gymnastic performer" .)