Obtain from rowing boat to shoot up (4)
I believe the answer is:
grow
'shoot up' is the definition.
(I've seen this in another clue)
'obtain from rowing boat' is the wordplay.
'from' suggests deleting specific letters.
'rowing' becomes 'boating' (with rowing boats).
'boat' becomes 'row' (rowing is a kind of boating).
'boating' with 'obtain' removed is 'g'.
'g'+'row'='GROW'
'to' is the link.
(Other definitions for grow that I've seen before include "Wax" , "Become larger" , "Multiply" , "Burgeon" , "Get bigger" .)