Steer front of boat in lake (5)
I believe the answer is:
oxbow
'lake' is the definition.
(I've seen this before)
'steer front of boat' is the wordplay.
'steer' becomes 'ox'.
'front of boat' becomes 'bow' (I've seen this before).
'ox'+'bow'='OXBOW'
'in' acts as a link.
(Other definitions for oxbow that I've seen before include "water feature" , "Loop formed by a horseshoe bend in a river" , "Type of lake" , "River-loop lake" , "Horseshoe shaped bend in a river" .)