German setter with yellow fluid in veins, as myth has it (5)
I believe the answer is:
ichor
'veins as myth has it' is the definition.
I can't judge whether this defines the answer.
'german setter with yellow fluid in' is the wordplay.
'german setter' becomes 'ic' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'with' says to put letters next to each other.
'yellow' becomes 'or' (heraldic term).
'fluid' becomes 'h' (H is an example).
'in' means one lot of letters goes inside another.
'ic'+'or'='icor'
'icor' going around 'h' is 'ICHOR'.
Can you help me to learn more?
(Other definitions for ichor that I've seen before include "Blood of the gods - o, rich stuff" , "Blood of the gods found in choir" , "flows divinely" , "Fluid said to flow in the veins of the gods" , "Superior blood" .)