I give out cards of the most desirable quality (5)
I believe the answer is:
ideal
'desirable quality' is the definition.
(a desirable quality or value)
'i give out cards of the most' is the wordplay.
'give out cards' becomes 'deal' (in a card game).
'of' becomes 'o''.
'the most' means to remove the last letter.
'i'+'deal'+'o'='idealo'
'idealo' with its final letter taken away is 'IDEAL'.
(Other definitions for ideal that I've seen before include "Perfect but perhaps unlikely to become reality" , "just the job" , "Just the ticket" , "'Perfect, model (5)'" , "faultless" .)