Clue: Neuter pony roughly, without love? One remaining foal, as before (9)
Answer: TRUEPENNY
Explanation: Definition: One remaining foal, as before
Foal > feal 
***(neuter pny)** [anag:*roughly*] where PNY is P(o)NY *without *O (love, in tennis)
 
A truepenny is an old word for a loyal or faithful follower