Masses of flying saucers hit (10)

I believe the answer is:

eucharists

'masses' is the definition.
(type of church service or mass)

'flying saucers hit' is the wordplay.
'flying' indicates an anagram.
'saucers'+'hit'='saucershit'
'saucershit' is an anagram of 'EUCHARISTS'.

'of' acts as a link.

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