Concerned with wings on sea (7)
I believe the answer is:
alarmed
'concerned' is the definition.
Both the answer and definition are adjectives. Maybe you can see a link between them that I don't see?
'wings on sea' is the wordplay.
'wings' becomes 'alar' (I've seen this before).
'on' means one lot of letters go next to another (in a down clue, letters appear on others).
'sea' becomes 'med' (short for Mediterranean).
'alar'+'med'='ALARMED'
'with' is the link.
Can you help me to learn more?
(Other definitions for alarmed that I've seen before include "as a door handle may be?" , "Frightened, frightened by danger" , "Fearful" , "Filled with apprehension" , "Fear-stricken" .)