March in time with soldiers these days (5)
I believe the answer is:
tread
'march' is the definition.
(I've seen this before)
'time with soldiers these days' is the wordplay.
'time' becomes 't'.
'with' says to put letters next to each other.
'soldiers' becomes 're' (Royal Engineers).
'these days' becomes 'ad' (as in Anno Domini, after Christ).
't'+'re'+'ad'='TREAD'
'in' acts as a link.
(Other definitions for tread that I've seen before include "Trample" , "Grooved surface of a tyre" , "Put one's foot down!" , "Part of flight" , "Tramp" .)