Lecherous fellow twirling bit of military tash (5)
I believe the answer is:
satyr
'lecherous fellow' is the definition.
'satyr' can be an answer for 'fellow' (I have seen 'oversexed fellow' mean 'satyr' so perhaps 'fellow' could also mean 'satyr'). I am not certain of the 'lecherous' bit.
'twirling bit of military tash' is the wordplay.
'twirling' says the letters should be written backwards.
'bit of' indicates the answer is hidden within the clue.
'rytas' is hidden in the letters of 'military tash'.
'rytas' in reverse letter order is 'SATYR'.
Can you help me to learn more?
(Other definitions for satyr that I've seen before include "Woodland god; butterfly" , "Goat-man attending Bacchus" , "Lecherous god" , "Woodland god, half man and half goat" , "Chased nymphs in the wood" .)