Calls for soldiers to get bundles of sheets (8)
I believe the answer is:
requires
'calls for' is the definition.
('require' can be a synonym of 'call for')
'soldiers to get bundles of sheets' is the wordplay.
'soldiers' becomes 're' (Royal Engineers).
'to get' means one lot of letters go next to another.
'bundles of sheets' becomes 'quires' (I am not sure about this - if you are sure you should believe this answer much more).
're'+'quires'='REQUIRES'
Can you help me to learn more?
(Other definitions for requires that I've seen before include "Demands or wants" , "Has need of" , "Needs or demands" .)