Doctor I caught beside the sea (5)
I believe the answer is:
Here is my best explanation:
'doctor' is the definition.
(I've seen this before)
'i caught beside the sea' is the subsidiary indication.
'caught' becomes 'c' (cricket abbreviation).
'beside' is a charade indicator (letters next to each other) (I've seen this in other clues).
'the sea' becomes 'med' (I've seen this before).
'ic' put after 'med' is 'medic'.
(Other definitions for medic that I've seen before include "A word for 'doctor'", "Physician (informal)", "He may offer treatment", "What was Basutoland", "Eg, doctor", "Doctor", "Word for 'doctor'" and "Health worker".)