Motivate one attending NASA (paid regularly by engineers) (7)
I believe the answer is:
inspire
'motivate' is the definition.
(thesaurus)
'one attending nasa paid regularly by engineers' is the wordplay.
'one' becomes 'i' (Roman numeral).
'attending' is a charade indicator (letters next to each other).
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
'by engineers' becomes 're' (Royal Engineers. I am not sure about the 'by' bit.**).
'nasa'+'paid'='nasapaid'
The alternate letters of 'nasapaid' are 'nspi'.
'i'+'nspi'+'re'='INSPIRE'
Can you help me to learn more?
(Other definitions for inspire that I've seen before include "Encourage - animate - draw into the lungs" , "Uplift" , "Galvanize" , "Animate (with feeling)" , "Fill a person with the urge to do something" .)