Clashing and not crashing around space station (9)
I believe the answer is:
dissonant
'clashing' is the definition.
(thesaurus)
'and not crashing around space station' is the wordplay.
'crashing' indicates anagramming the letters.
'around' is an insertion indicator.
'space station' becomes 'iss' (International Space Station).
'and'+'not'='andnot'
'andnot' anagrammed gives 'donant'.
'donant' going around 'iss' is 'DISSONANT'.
(Other definitions for dissonant that I've seen before include "Lacking harmony" , "grating" , "sounding harsh" , "incongruous" .)