Husband joining a navy ship under European control (7)
I believe the answer is:
harness
'control' is the definition.
(I know that harness is a kind of control)
'husband joining a navy ship under european' is the wordplay.
'husband' becomes 'h' (abbreviation).
'joining' is an insertion indicator (inserted letters join the word).
'navy' becomes 'RN' (Royal Navy).
'ship' becomes 'SS' (prefix in ship names eg SS Great Britain).
'under european' becomes 'e' (abbreviation e.g. EU. I am not sure about the 'under' bit.).
'a'+'rn'+'ss'='arnss'
'arnss' placed around 'e' is 'arness'.
'h'+'arness'='HARNESS'
Can you help me to learn more?
(Other definitions for harness that I've seen before include "Straps fitted to a horse" , "Parachute straps" , "Couple" , "Fasten (horse to cart)" , "Arrangement of straps for a horse" .)