It's very slow doing a manicure in space (6,4)
I believe the answer is:
snails pace
'it's very slow doing a' is the definition.
I can't judge whether this defines the answer.
'manicure in space' is the wordplay.
'manicure' becomes 'snail' (I can't explain this - if you can you should give a lot more credence to this answer).
'snail'+'space'='SNAILS PACE'
Can you help me to learn more?
(Other definitions for snails pace that I've seen before include "at a very low rate" , "Very slow speed" , "no rush" , "making slow progress" , "Slow rate of progress" .)