The most common and most likely answer to this crossword clue is the 5 letter word PENIS
P
E
N
I
S
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The straight part
We know that "member" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case member = penis.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does PENIS mean?
PENIS noun- The male reproductive organ used for sexual intercourse that in the human male and some other mammals is also used for urination; the tubular portion of the male genitalia (excluding the scrotum).