Ready for money, empty pocket (6)
I believe the answer is:
prompt
'ready' is the definition.
(similar in meaning)
'for money empty pocket' is the wordplay.
'for' becomes 'pro' (as in being 'pro' something).
'money' becomes 'm' (abbreviation used in economics).
'empty' means to remove the middle letters.
'pocket' with its middle removed is 'pt'.
'pro'+'m'+'pt'='PROMPT'
(Other definitions for prompt that I've seen before include "Help struggling actor" , "Instantaneous" , "Cue; punctual" , "Cue given to actor" , "Incite - punctual" .)