Secret soldiers behind hotel window (4)
I believe the answer is:
sash
'window' is the definition.
(I've seen this before)
'secret soldiers behind hotel' is the wordplay.
'secret soldiers' becomes 'sas' (Special Air Service. I am not sure about the 'secret' bit.).
'behind' says to put letters next to each other.
'hotel' becomes 'h' (phonetic alphabet: alpha, bravo, charlie etc.).
'sas'+'h'='SASH'
Can you help me to learn more?
(Other definitions for sash that I've seen before include "Decoration for the twelfth" , "Broad band, the one me father wore?" , "Girdle" , "Window frame; silk band" , "Popular band in Northern Ireland" .)