King entering valleys to do for alien invaders? (6)
I believe the answer is:
daleks
'do for alien invaders?' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.
'king entering valleys' is the wordplay.
'king' becomes 'k' (abbreviation for king in chess).
'entering' is an insertion indicator.
'valleys' becomes 'dales' (dale is a kind of valley).
'k' put inside 'dales' is 'DALEKS'.
'to' acts as a link.
Can you help me to learn more?
(Other definitions for daleks that I've seen before include "Doctor Who baddies" , "Dr Who's main enemies" , "Who fights these" , "Major adversary" , "Enemies in 13 ac" .)