Unlikely to approve of horseplay (5)
I believe the answer is:
stern
(Other definitions for stern that I've seen before include "Grave; rear" , "Forbidding, austere" , "Dour" , "Severe part of the ship?" , "Unyielding part of the ship" .)
I believe the answer is:
stern
(Other definitions for stern that I've seen before include "Grave; rear" , "Forbidding, austere" , "Dour" , "Severe part of the ship?" , "Unyielding part of the ship" .)