Wooden reinforcing strip (6)
I believe the answer is:
batten
'wooden reinforcing strip' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for batten that I've seen before include "Fasten securely - say the hatches" , "Close securely, say the hatches" , "Wooden fastening strip" , "Wooden stiffening strip" , "Gain nourishment" .)