Kentucky brought in block for historic NASA mission (6)
I believe the answer is:
skylab
'historic nasa mission' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.
'kentucky brought in block' is the wordplay.
'kentucky' becomes 'ky' (abbreviation).
'brought in' indicates putting letters inside.
'block' becomes 'slab' (slab is a kind of block).
'ky' placed within 'slab' is 'SKYLAB'.
'for' acts as a link.
Can you help me to learn more?
(Other definitions for skylab that I've seen before include "1973-79 space station" , "with space to explore" , "US space station launched in 1973" , "Early US space station" , "1970s' space station" .)