Room to return and secure boat (4)
I believe the answer is:
moor
'secure boat' is the definition.
'moor' can be an answer for 'secure' (mooring is a kind of securing). I'm unsure of the 'boat' bit.
'room to return' is the wordplay.
'to return' shows that the letters should be reversed in order.
'room' in reverse letter order is 'MOOR'.
'and' is the link.
Can you help me to learn more?
(Other definitions for moor that I've seen before include "Ground that's high" , "Ilkley or Bodmin" , "Othello, perhaps" , "Secure boat with ropes" , "North African - secure a boat - tract of land" .)