Is interrupting a player with imperfect speech (4)
I believe the answer is:
lisp
'imperfect speech' is the definition.
(I've seen this in another clue)
'is interrupting a player' is the wordplay.
'interrupting' means one lot of letters goes inside another.
'a player' becomes 'lp' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'is' going inside 'lp' is 'LISP'.
'with' acts as a link.
Can you help me to learn more?
(Other definitions for lisp that I've seen before include "Non-standard pronunciation" , "Be unable to pronounce S" , "Speak with defective sibilants" , "Thpeak like thith" , "Talk like thith" .)