Perhaps nosy learner follows explorers of space (5)
I believe the answer is:
nasal
'perhaps nosy' is the definition.
'nasal' can be an answer for 'nosy' (relating to the nose). I'm not sure about the 'perhaps' bit.
'learner follows explorers of space' is the wordplay.
'learner' becomes 'l' (as in a learner driver with L-plates on their car).
'follows' is a charade indicator (letters next to each other).
'explorers of space' becomes 'nasa' (I can't explain this - if you can you should give a lot more credence to this answer).
'l' put after 'nasa' is 'NASAL'.
Can you help me to learn more?
(Other definitions for nasal that I've seen before include "Rhinal" , "Beak's" , "of central feature" , "front piece of helmet" , "Nosey" .)