Secret soldiers at hotel window (4)
I believe the answer is:
sash
'window' is the definition.
(I've seen this before)
'secret soldiers at hotel' is the wordplay.
'secret soldiers' becomes 'sas' (Special Air Service. I am not sure about the 'secret' bit.).
'at' means one lot of letters go next to another.
'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" , "Piece of cloth round waist or shoulder" , "Waistband - type of window" , "Type of sliding window" , "Ribbon worn over the shoulder" .)