Flat out looking right into a male gland (9)
I believe the answer is:
prostrate
'flat' is the definition.
(laying flat)
'right into a male gland' is the wordplay.
'right' becomes 'r' (common abbreviation).
'into' means one lot of letters goes inside another.
'a male gland' becomes 'prostate' (I've seen this in another clue).
'r' inserted inside 'prostate' is 'PROSTRATE'.
'out looking' acts as a link.
This may not be correct. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for prostrate that I've seen before include "Totally exhausted" , "no longer able to stand" , "Lying face-down" , "helpless" , "Horizontal" .)