Officer commanding Irish bird in charge of marine (7)
I believe the answer is:
oceanic
'marine' is the definition.
(marine means relating to the sea)
'officer commanding irish bird in charge' is the wordplay.
'officer' becomes 'oc' (I've seen this in other clues).
'commanding irish bird' becomes 'ean' (I am not sure about this - if you are sure you should believe this answer much more).
'in charge' becomes 'ic' (abbreviation for 'in charge').
'oc'+'ean'+'ic'='OCEANIC'
'of' is the link.
Can you help me to learn more?
(Other definitions for oceanic that I've seen before include "vast waves?" , "In deep water" , "Relating to large areas of water" , "Relating to the high seas" , "Huge" .)