Blasphemy awes strangely on telephone call (8)
I believe the answer is:
swearing
'blasphemy' is the definition.
(thesaurus)
'awes strangely on telephone call' is the wordplay.
'strangely' indicates an anagram.
'on' means one lot of letters go next to another.
'telephone call' becomes 'ring' (I've seen this in another clue).
'awes' anagrammed gives 'swea'.
'swea'+'ring'='SWEARING'
(Other definitions for swearing that I've seen before include "Vowing" , "Using bad language" , "Expressing annoyance" , "Affirming or cursing" , "promising" .)