A walk in spring (5)
I believe the answer is:
march
I believe this is a double definition.
'a walk' is the first definition.
(march is a kind of walk)
'in spring' is the second definition.
('March' is part of 'spring')
(Other definitions for march that I've seen before include "Walk smartly" , "Walk in a resolute manner" , "Moving demonstration" , "Protest; month" , "Stride; month" .)