Reserve hotel with counterfeit yen in three seconds (7)
I believe the answer is:
shyness
'reserve' is the definition.
(I've seen this before)
'hotel with counterfeit yen in three seconds' is the wordplay.
'hotel' becomes 'h' (phonetic alphabet: alpha, bravo, charlie etc.).
'with' is a charade indicator (letters next to each other).
'counterfeit' indicates anagramming the letters.
'in' indicates putting letters inside.
'three seconds' becomes 'sss' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'yen' is an anagram of 'yne'.
'h'+'yne'='hyne'
'hyne' inserted inside 'sss' is 'SHYNESS'.
Can you help me to learn more?
(Other definitions for shyness that I've seen before include "Bashfulness" , "Nervousness, timidity" , "Reserve" , "Bashful nature" , "Diffidence" .)