Related Clues:

• Mount for the god Neptune
• Small fish with equine-like head.
• Small marine creature of equine nomenclature
• Small fish with head like an engine animal
• Small upright fish with equine head
• Small equine marine creature
• That's a fishy way to have a bit of a material turn
• No amateur villain would be able to stop the sitting like this.
• Is it up to a bit of stuff to be so fishy?
• Up here there's a scrap of fish
• The scrap turns up for the start of 21 across (3)
• Fish the bit of stuff up
• So fishy to have a scrap up like this
• The fish might get to a blooming den
• Spearlike fish