The most common and most likely answer to this crossword clue is the 5 letter word DITTO
I've seen this crossword clue in Independent
D
I
T
T
O
More clues leading to the result DITTO
- The same detective returned over the top
- The same artist's not in Radio Times cutting
- The same song, shortly over
- The same part of depot tidied up
- The same party diktat occasionally creeping in
- One on soft drinks during party gets the same again
- Love song cut short opening in the same manner
- Simple song finally changed — it’s the same again!
- Copied it totally, but only a part is the same again
- Some said it too
Buddy explains!

The straight part
We know that "likewise" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case likewise = ditto.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 DITTO mean?
DITTO noun- That which was stated before, the aforesaid, the above, the same, likewise.
- A duplicate or copy of a document, particularly one created by a spirit duplicator.
- A copy; an imitation.
- A symbol, represented by two apostrophes, inverted commas, or quotation marks (" "), when indicating that the item preceding is to be repeated.
- (in the plural) A suit of clothes of the same colour throughout.
- To repeat the aforesaid, the earlier action etc.
- As said before, likewise.
- Used as an expression of agreement with what another person has said, or to indicate that what they have said equally applies to the person being addressed.