Crossword Genius

Therefore cover is reliable (5)

Ross

I believe the answer is:

solid

'reliable' is the definition.
(thesaurus)

'therefore cover' is the wordplay.
'therefore' becomes 'so'.
'cover' becomes 'lid' (lid is a kind of cover).
'so'+'lid'='SOLID'

'is' is the link.

(Other definitions for solid that I've seen before include "Dense" , "Rock-hard" , "Of substance" , "thick" , "Reliable - substantial - pure" .)

I've seen this clue in The Telegraph.
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