Person in command of isle appears regularly in magazines (3)
I believe the answer is:
man
'person' is the definition.
(man is a kind of person)
'command of isle appears regularly in magazines' is the wordplay.
'MAN' is hidden in amongst the letters.
But, I am uncertain how the hidden word is indicated.
'in' acts as a link.
Can you help me to learn more?
(Other definitions for man that I've seen before include "-- Friday" , "Irish Sea isle" , "Bishop, perhaps" , "race" , "knight, perhaps?" .)