Excite a single scoundrel, taking Sierra for spin (4,2,4,4)
I believe the answer is:
turn on ones heel
'spin' is the definition.
I know nothing about this answer so I cannot tell whether this works.
'excite a single scoundrel taking sierra' is the wordplay.
'excite' becomes 'turn on' (synonyms).
'a single' becomes 'one' (a single thing - only one).
'scoundrel' becomes 'heel' (heel can mean a scoundrel or villain).
'taking' indicates putting letters inside.
'sierra' becomes 'S' (phonetic alphabet: alpha, bravo, charlie etc.).
'one'+'heel'='oneheel'
'oneheel' placed around 's' is 'onesheel'.
'turnon'+'onesheel'='TURN ON ONES HEEL'
'for' acts as a link.
Can you help me to learn more?
(Other definitions for turn on ones heel that I've seen before include "Make a quick rotation and go back" , "head back suddenly" .)