“Guy in charge is entertaining island pair” I see what you’re saying (3-6)
I believe the answer is:
lip-reader
'i see what you're saying' is the definition.
(a lip reader literally sees what someone's saying)
'guy in charge is entertaining island pair' is the wordplay.
'guy in charge' becomes 'leader' (a leader is in charge).
'is entertaining' indicates putting letters inside.
'island' becomes 'i' (geographical abbreviation).
'pair' becomes 'pr' (abbreviation).
'i'+'pr'='ipr'
'leader' placed around 'ipr' is 'LIP-READER'.
(Another definition for lip-reader that I've seen is " Person interpreting from mouth movements".)