Dance poorly, say, with no visible effort (4,3)
I believe the answer is:
reel off
'dance poorly say with no visible effort' is the definition.
I can't judge whether this defines the answer.
'dance poorly say with no' is the wordplay.
'dance' becomes 'reel' (reel is a kind of dance).
'poorly say' becomes 'ff' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'with' means one lot of letters go next to another.
'no' becomes 'O' (O resembles 0).
'ff' after 'o' is 'off'.
'reel'+'off'='REEL OFF'
Can you help me to learn more?
(Other definitions for reel off that I've seen before include "Rapidly announce" , "Utter (something) rapidly and fluently" , "stagger away" , "Speak very rapidly" , "Say (something) rapidly and effortlessly" .)