Studying danger at sea involving current (7)
I believe the answer is:
reading
'studying' is the definition.
('read' can be a synonym of 'study')
'danger at sea involving current' is the wordplay.
'at sea' is an anagram indicator.
'involving' indicates putting letters inside.
'current' becomes 'i' (symbol for electric current).
'danger' with letters rearranged gives 'readng'.
'readng' placed around 'i' is 'READING'.
(Other definitions for reading that I've seen before include "Grained (anag)" , "Recital" , "Perusing in an English town?" , "southern English town" , "Quiet activity" .)