Be thankful for B minus (5)

I believe the answer is:

bless

'be thankful for' is the definition.
(I've seen this before)

'b minus' is the wordplay.
'minus' becomes 'less' (I've seen this in another clue).
'b'+'less'='BLESS'

(Other definitions for bless that I've seen before include "Render holy" , "Call on God to favour" , "Invoke divine favour on" , "Consecrate; be thankful for" , "set aside for holy purpose?" .)

I've seen this clue in The Telegraph.

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